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Netpbm vs NConvert: catalog facts
Netpbm	NConvert
Free Free and freely redistributable.	Freemium Freeware for private use; commercial use requires a business licence from 100 euros plus…
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Over 350 separate tools Converters for about 100 graphics formats	Reads more than 500 image formats and writes about 70 More than 80 commands for transforms, adjustments, filters and metadata
No interactive or graphical tools Many small programs to learn instead of one command	Commercial use requires a paid licence No graphical interface; XnConvert is the GUI equivalent
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	License: Freeware
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.